From Green Card to Citizenship: Every Path to Naturalization Explained

Most green card holders can apply for U.S. citizenship after five years — but not everyone. The waiting period and the rules depend on how you got your green card and your personal situation. This guide walks through each path, so you know exactly when you can file Form N-400 and what you need to prove.

The standard path: 5 years as a permanent resident

This is the most common route. It applies to most employment-based, family-based, and diversity visa green card holders. To qualify, you must:

• Be at least 18 years old when you file
• Have been a lawful permanent resident for at least 5 years
• Have lived continuously in the U.S. for those 5 years
• Have been physically present in the U.S. for at least 30 months out of those 5 years
• Have lived for at least 3 months in the state or USCIS district where you apply
• Show good moral character for the 5 years before filing (and until your oath)
• Read, write, and speak basic English
• Pass the civics test on U.S. history and government
• Take the Oath of Allegiance

Married to a U.S. citizen: 3 years

If you are married to and living with a U.S. citizen, the wait drops to 3 years. The rules:

• Be a permanent resident for at least 3 years
• Live in marital union with your U.S. citizen spouse for all 3 years before filing, and stay married until you naturalize
• Be physically present in the U.S. for at least 18 months out of the 3 years
• Your spouse must have been a U.S. citizen for the entire 3 years

If you divorce or stop living together before the oath, you generally fall back to the 5-year rule.

Military service: the fastest path

Current and former members of the U.S. armed forces get the most generous rules:

• One year of honorable service (INA 328): you can apply without meeting the usual residence and physical presence requirements, and there is no filing fee
• Service during designated periods of hostilities (INA 329): you may apply without any minimum period of residence or physical presence at all — even immediately
• Spouses of service members stationed abroad may also qualify for expedited naturalization

Other special categories

• Refugees and asylees: your time as a refugee or asylee can count toward the 5 years, because your green card is backdated (refugees: to the date of entry; asylees: one year before the green card was approved)
• VAWA self-petitioners and certain victims of abuse: may use the 3-year rule without still being married to the abuser
• Spouses of U.S. citizens working abroad for the U.S. government, military, or qualifying organizations: may naturalize without meeting the continuous residence requirement
• Children of U.S. citizens: may acquire citizenship automatically or through a faster process, without naturalizing themselves

Rules that apply to every applicant

Whichever path you take, these application rules are the same:

You can file 90 days early

USCIS lets you file Form N-400 up to 90 days before you reach your 3-year or 5-year anniversary. Filing earlier than that gets your application rejected.

Watch your travel

• Trips of more than 6 months but less than 1 year may break your continuous residence unless you can prove you kept your life in the U.S.
• Trips of 1 year or more almost always break continuous residence, and you may need to start the clock over
• Keep a record of every trip outside the U.S. — you must list them all on the N-400

Good moral character

USCIS reviews your record for the 3 or 5 years before you file. Certain crimes, unpaid taxes, failure to pay child support, or lying to immigration officers can lead to a denial — and in serious cases, worse. If anything in your past worries you, talk to an immigration attorney before filing.

English and civics

Most applicants must pass an English test (reading, writing, speaking) and the civics test. Exceptions:

• 50/20 rule: age 50 or older with 20 years as a permanent resident — take the civics test in your language
• 55/15 rule: age 55 or older with 15 years as a permanent resident — same exception
• 65/20 rule: age 65 or older with 20 years as a permanent resident — take the test in your language, from a shorter list of 20 questions
• Medical disability: a doctor-certified condition may excuse you from one or both tests (Form N-648)

Which civics test will you take?

If you filed your N-400 on or after October 20, 2025, you take the 2025 test: 20 questions from a pool of 128, and you need 12 correct to pass. If you filed before that date, you take the 2008 test: 10 questions from 100, needing 6 correct. Our practice tests and flashcards cover both versions.

How to apply

1. Confirm your eligibility category and your earliest filing date 2. Create a USCIS online account and file Form N-400 online (or by mail) 3. Pay the filing fee — currently $710 online or $760 by mail, with fee waivers and reduced fees available for those who qualify (a proposed increase is not yet in effect, so check the USCIS fee schedule when you file) 4. Attend your biometrics appointment 5. Prepare for the interview: English test, civics test, and questions about your application 6. If approved, take the Oath of Allegiance — you are a U.S. citizen

The bottom line

Your path to citizenship depends on your category: 5 years for most, 3 years if married to a U.S. citizen, and little or no wait for military members. Whatever your path, the civics test is the same challenge — and it is the part you can start preparing for today. Try a free practice test to see where you stand.

*Sources: USCIS — I am a Lawful Permanent Resident of 5 Years, USCIS — I am Married to a U.S. Citizen, USCIS — Naturalization Through Military Service, USCIS — Continuous Residence and Physical Presence, USAGov — Become a U.S. citizen*